1. Department of Chemical Processes & Environments, The University of Kitakyushu, 1-1 Hibikino, Wakamatu-ku, Kitakyushu, Fukuoka 808-0135, Japan, and Advanced Material Business Promotion Department, Osaka Gas Co., Ltd. 6-19-9, Torishima Konohana-ku, Osaka 554-0051, Japan